/[thuban]/branches/WIP-pyshapelib-bramz/Thuban/UI/view.py
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revision 159 by bh, Wed May 8 13:46:15 2002 UTC revision 2454 by bh, Mon Dec 13 18:26:11 2004 UTC
# Line 1  Line 1 
1  # Copyright (c) 2001, 2002 by Intevation GmbH  # Copyright (c) 2001, 2002, 2003, 2004 by Intevation GmbH
2  # Authors:  # Authors:
3  # Bernhard Herzog <[email protected]>  # Bernhard Herzog <[email protected]>
4    # Frank Koormann <[email protected]>
5  #  #
6  # This program is free software under the GPL (>=v2)  # This program is free software under the GPL (>=v2)
7  # Read the file COPYING coming with Thuban for details.  # Read the file COPYING coming with Thuban for details.
# Line 9  Line 10 
10  Classes for display of a map and interaction with it  Classes for display of a map and interaction with it
11  """  """
12    
13    from __future__ import generators
14    
15  __version__ = "$Revision$"  __version__ = "$Revision$"
16    # $Source$
17    # $Id$
18    
19  from math import hypot  import os.path
20    import time
21    import traceback
22    
23  from wxPython.wx import wxWindow,\  from wxPython.wx import wxWindow, \
24       wxPaintDC, wxColour, wxClientDC, wxINVERT, wxTRANSPARENT_BRUSH, wxFont,\       wxPaintDC, wxColour, wxClientDC, wxINVERT, wxTRANSPARENT_BRUSH, wxFont,\
25       EVT_PAINT, EVT_LEFT_DOWN, EVT_LEFT_UP, EVT_MOTION, EVT_LEAVE_WINDOW       EVT_PAINT, EVT_LEFT_DOWN, EVT_LEFT_UP, EVT_MOTION, EVT_LEAVE_WINDOW, \
26         wxPlatform, wxBeginBusyCursor, wxEndBusyCursor, wxFileDialog, wxSAVE, \
27         wxOVERWRITE_PROMPT, wxID_OK
28    
29    # Export related stuff
30    if wxPlatform == '__WXMSW__':
31        from wxPython.wx import wxMetaFileDC
32    
33  from wxPython import wx  from wxPython import wx
34    
35  from wxproj import point_in_polygon_shape, shape_centroid  from Thuban import _
   
36    
37  from Thuban.Model.messages import MAP_PROJECTION_CHANGED, \  from Thuban.Model.messages import MAP_LAYERS_CHANGED, LAYER_CHANGED, \
38       LAYERS_CHANGED, LAYER_LEGEND_CHANGED, LAYER_VISIBILITY_CHANGED       LAYER_VISIBILITY_CHANGED
 from Thuban.Model.layer import SHAPETYPE_POLYGON, SHAPETYPE_ARC, \  
      SHAPETYPE_POINT  
 from Thuban.Model.label import ALIGN_CENTER, ALIGN_TOP, ALIGN_BOTTOM, \  
      ALIGN_LEFT, ALIGN_RIGHT  
 from Thuban.Lib.connector import Publisher  
39    
40  from renderer import ScreenRenderer, PrinterRender  from renderer import ScreenRenderer, ExportRenderer, PrinterRenderer
41    
42  import labeldialog  import labeldialog
43    
44  from messages import SELECTED_SHAPE, VIEW_POSITION  from viewport import ViewPort, PanTool, output_transform
   
   
 #  
 #   The tools  
 #  
   
 class Tool:  
   
     """  
     Base class for the interactive tools  
     """  
   
     def __init__(self, view):  
         """Intitialize the tool. The view is the canvas displaying the map"""  
         self.view = view  
         self.start = self.current = None  
         self.dragging = 0  
         self.drawn = 0  
   
     def Name(self):  
         """Return the tool's name"""  
         return ''  
   
     def drag_start(self, x, y):  
         self.start = self.current = x, y  
         self.dragging = 1  
   
     def drag_move(self, x, y):  
         self.current = x, y  
   
     def drag_stop(self, x, y):  
         self.current = x, y  
         self.dragging = 0  
   
     def Show(self, dc):  
         if not self.drawn:  
             self.draw(dc)  
         self.drawn = 1  
   
     def Hide(self, dc):  
         if self.drawn:  
             self.draw(dc)  
         self.drawn = 0  
   
     def draw(self, dc):  
         pass  
   
     def MouseDown(self, event):  
         self.drag_start(event.m_x, event.m_y)  
   
     def MouseMove(self, event):  
         if self.dragging:  
             self.drag_move(event.m_x, event.m_y)  
   
     def MouseUp(self, event):  
         if self.dragging:  
             self.drag_move(event.m_x, event.m_y)  
   
     def Cancel(self):  
         self.dragging = 0  
   
   
 class RectTool(Tool):  
   
     """Base class for tools that draw rectangles while dragging"""  
45    
46      def draw(self, dc):  class CanvasPanTool(PanTool):
         sx, sy = self.start  
         cx, cy = self.current  
         dc.DrawRectangle(sx, sy, cx - sx, cy - sy)  
47    
48  class ZoomInTool(RectTool):      """The Canvas Pan Tool"""
   
     """The Zoom-In Tool"""  
   
     def Name(self):  
         return "ZoomInTool"  
   
     def proj_rect(self):  
         """return the rectangle given by start and current in projected  
         coordinates"""  
         sx, sy = self.start  
         cx, cy = self.current  
         left, top = self.view.win_to_proj(sx, sy)  
         right, bottom = self.view.win_to_proj(cx, cy)  
         return (min(left, right), min(top, bottom),  
                 max(left, right), max(top, bottom))  
   
     def MouseUp(self, event):  
         if self.dragging:  
             Tool.MouseUp(self, event)  
             sx, sy = self.start  
             cx, cy = self.current  
             if sx == cx and sy == cy:  
                 # Just a mouse click. Simply zoom in by a factor of two  
                 self.view.ZoomFactor(2, center = (cx, cy))  
             else:  
                 # A drag. Zoom in to the rectangle  
                 self.view.FitRectToWindow(self.proj_rect())  
   
   
 class ZoomOutTool(RectTool):  
   
     """The Zoom-Out Tool"""  
       
     def Name(self):  
         return "ZoomOutTool"  
   
     def MouseUp(self, event):  
         if self.dragging:  
             Tool.MouseUp(self, event)  
             sx, sy = self.start  
             cx, cy = self.current  
             if sx == cx and sy == cy:  
                 # Just a mouse click. Simply zoom out by a factor of two  
                 self.view.ZoomFactor(0.5, center = (cy, cy))  
             else:  
                 # A drag. Zoom out to the rectangle  
                 self.view.ZoomOutToRect((min(sx, cx), min(sy, cy),  
                                          max(sx, cx), max(sy, cy)))  
   
   
 class PanTool(Tool):  
   
     """The Pan Tool"""  
   
     def Name(self):  
         return "PanTool"  
49    
50      def MouseMove(self, event):      def MouseMove(self, event):
51          if self.dragging:          if self.dragging:
52              Tool.MouseMove(self, event)              PanTool.MouseMove(self, event)
53              sx, sy = self.start              sx, sy = self.start
54              x, y = self.current              x, y = self.current
55              width, height = self.view.GetSizeTuple()              width, height = self.view.GetSizeTuple()
56    
57              bitmapdc = wx.wxMemoryDC()              bitmapdc = wx.wxMemoryDC()
58              bitmapdc.SelectObject(self.view.bitmap)              bitmapdc.SelectObject(self.view.PreviewBitmap())
59    
60              dc = self.view.drag_dc              dc = self.view.drag_dc
61              dc.Blit(0, 0, width, height, bitmapdc, sx - x, sy - y)              dc.Blit(0, 0, width, height, bitmapdc, sx - x, sy - y)
62    
     def MouseUp(self, event):  
         if self.dragging:  
             Tool.MouseUp(self, event)  
             sx, sy = self.start  
             cx, cy = self.current  
             self.view.Translate(cx - sx, cy - sy)  
           
 class IdentifyTool(Tool):  
   
     """The "Identify" Tool"""  
       
     def Name(self):  
         return "IdentifyTool"  
   
     def MouseUp(self, event):  
         self.view.SelectShapeAt(event.m_x, event.m_y)  
   
   
 class LabelTool(Tool):  
   
     """The "Label" Tool"""  
   
     def Name(self):  
         return "LabelTool"  
   
     def MouseUp(self, event):  
         self.view.LabelShapeAt(event.m_x, event.m_y)  
   
   
   
   
63  class MapPrintout(wx.wxPrintout):  class MapPrintout(wx.wxPrintout):
64    
65      """      """
66      wxPrintout class for printing Thuban maps      wxPrintout class for printing Thuban maps
67      """      """
68    
69      def __init__(self, map):      def __init__(self, canvas, map, region, selected_layer, selected_shapes):
70          wx.wxPrintout.__init__(self)          wx.wxPrintout.__init__(self)
71            self.canvas = canvas
72          self.map = map          self.map = map
73            self.region = region
74            self.selected_layer = selected_layer
75            self.selected_shapes = selected_shapes
76    
77      def GetPageInfo(self):      def GetPageInfo(self):
78          return (1, 1, 1, 1)          return (1, 1, 1, 1)
# Line 231  class MapPrintout(wx.wxPrintout): Line 86  class MapPrintout(wx.wxPrintout):
86    
87      def draw_on_dc(self, dc):      def draw_on_dc(self, dc):
88          width, height = self.GetPageSizePixels()          width, height = self.GetPageSizePixels()
89          llx, lly, urx, ury = self.map.ProjectedBoundingBox()          scale, offset, mapregion = output_transform(self.canvas.scale,
90          scalex = width / (urx - llx)                                                      self.canvas.offset,
91          scaley = height / (ury - lly)                                                      self.canvas.GetSizeTuple(),
92          scale = min(scalex, scaley)                                                      self.GetPageSizePixels())
         offx = 0.5 * (width - (urx + llx) * scale)  
         offy = 0.5 * (height + (ury + lly) * scale)  
   
93          resx, resy = self.GetPPIPrinter()          resx, resy = self.GetPPIPrinter()
94          renderer = PrinterRender(dc, scale, (offx, offy), resolution = resx)          canvas_scale = self.canvas.scale
95          renderer.RenderMap(self.map)          x, y, width, height = self.region
96          return wx.true          renderer = PrinterRenderer(dc, self.map, scale, offset,
97                                               region = (mapregion[0], mapregion[1],
98                                                 (width/canvas_scale)*scale,
99                                                 (height/canvas_scale)*scale),
100                                       resolution = resy,
101                                       destination_region = mapregion)
102            renderer.RenderMap(self.selected_layer, self.selected_shapes)
103            return True
104    
105    
106  class MapCanvas(wxWindow, Publisher):  class MapCanvas(wxWindow, ViewPort):
107    
108      """A widget that displays a map and offers some interaction"""      """A widget that displays a map and offers some interaction"""
109    
110      def __init__(self, parent, winid, interactor):      def __init__(self, parent, winid):
111          wxWindow.__init__(self, parent, winid)          wxWindow.__init__(self, parent, winid)
112          self.SetBackgroundColour(wxColour(255, 255, 255))          ViewPort.__init__(self)
   
         # the map displayed in this canvas. Set with SetMap()  
         self.map = None  
   
         # scale and offset describe the transformation from projected  
         # coordinates to window coordinates.  
         self.scale = 1.0  
         self.offset = (0, 0)  
   
         # whether the user is currently dragging the mouse, i.e. moving  
         # the mouse while pressing a mouse button  
         self.dragging = 0  
   
         # the currently active tool  
         self.tool = None  
   
         # The current mouse position of the last OnMotion event or None  
         # if the mouse is outside the window.  
         self.current_position = None  
   
         # If true, OnIdle will call do_redraw to do the actual  
         # redrawing. Set by OnPaint to avoid some unnecessary redraws.  
         # To force a redraw call full_redraw().  
         self.redraw_on_idle = 0  
113    
114          # The region to update when idle          self.SetBackgroundColour(wxColour(255, 255, 255))
         self.update_region = wx.wxRegion()  
115    
116          # the bitmap serving as backing store          # the bitmap serving as backing store
117          self.bitmap = None          self.bitmap = None
118            # the monochrome bitmap with the selection if any
119            self.selection_bitmap = None
120    
121            self.backgroundColor = wx.wxWHITE_BRUSH
122    
123          # the interactor          # The rendering iterator object. Used when rendering
124          self.interactor = interactor          # incrementally
125          self.interactor.Subscribe(SELECTED_SHAPE, self.shape_selected)          self.render_iter = None
126    
127          # subscribe the WX events we're interested in          # subscribe the WX events we're interested in
128          EVT_PAINT(self, self.OnPaint)          EVT_PAINT(self, self.OnPaint)
# Line 297  class MapCanvas(wxWindow, Publisher): Line 135  class MapCanvas(wxWindow, Publisher):
135    
136      def __del__(self):      def __del__(self):
137          wxWindow.__del__(self)          wxWindow.__del__(self)
138          Publisher.__del__(self)          ViewPort.__del__(self)
139    
140        def PreviewBitmap(self):
141            return self.bitmap
142    
143        def PanTool(self):
144            """Start the canvas pan tool"""
145            self.SelectTool(CanvasPanTool(self))
146            
147        def SetMap(self, map):
148            redraw_channels = (MAP_LAYERS_CHANGED, LAYER_CHANGED,
149                               LAYER_VISIBILITY_CHANGED)
150            if self.Map() is not None:
151                for channel in redraw_channels:
152                    self.Map().Unsubscribe(channel, self.full_redraw)
153    
154            ViewPort.SetMap(self, map)
155    
156            if self.Map() is not None:
157                for channel in redraw_channels:
158                    self.Map().Subscribe(channel, self.full_redraw)
159    
160            # force a redraw. If map is not empty, it's already been called
161            # by FitMapToWindow but if map is empty it hasn't been called
162            # yet so we have to explicitly call it.
163            self.full_redraw()
164    
165      def OnPaint(self, event):      def OnPaint(self, event):
166          dc = wxPaintDC(self)          dc = wxPaintDC(self)
167          if self.map is not None and self.map.HasLayers():          if self.Map() is not None and self.Map().HasLayers():
168              # We have a non-empty map. Redraw it in idle time              if self.bitmap is not None:
169              self.redraw_on_idle = 1                  dc.BeginDrawing()
170              # update the region that has to be redrawn                  dc.DrawBitmap(self.bitmap, 0, 0)
171              self.update_region.UnionRegion(self.GetUpdateRegion())                  if self.selection_bitmap is not None:
172                        dc.DrawBitmap(self.selection_bitmap, 0, 0, True)
173                    dc.EndDrawing()
174          else:          else:
175              # If we've got no map or if the map is empty, simply clear              # If we've got no map or if the map is empty, simply clear
176              # the screen.              # the screen.
177                
178              # XXX it's probably possible to get rid of this. The              # XXX it's probably possible to get rid of this. The
179              # background color of the window is already white and the              # background color of the window is already white and the
180              # only thing we may have to do is to call self.Refresh()              # only thing we may have to do is to call self.Refresh()
181              # with a true argument in the right places.              # with a true argument in the right places.
182              dc.BeginDrawing()              dc.BeginDrawing()
183              dc.Clear()                          dc.SetBackground(self.backgroundColor)
184                dc.Clear()
185              dc.EndDrawing()              dc.EndDrawing()
186    
187              # clear the region      def OnIdle(self, event):
188              self.update_region = wx.wxRegion()          """Idle handler. Redraw the bitmap if necessary"""
189            if (self.Map() is not None
190      def do_redraw(self):              and (self.bitmap is None
191          # This should only be called if we have a non-empty map.                   or self.render_iter is not None
192                     or (self.HasSelectedShapes()
193          # get the update region and reset it. We're not actually using                       and self.selection_bitmap is None))):
194          # it anymore, though.              event.RequestMore(self._do_redraw())
195          update_box = self.update_region.GetBox()  
196          self.update_region = wx.wxRegion()      def _do_redraw(self):
197            """Redraw a bit and return whether this method has to be called again.
198    
199            Called by OnIdle to handle the actual redraw. Redraw is
200            incremental for both the bitmap with the normal layers and the
201            bitmap with the selection.
202            """
203            finished = False
204            if self.render_iter is not None:
205                try:
206                    if self.render_iter.next():
207                        # Redraw if the last preview redraw was some time
208                        # ago and the user is not currently dragging the
209                        # mouse because redrawing would interfere with what
210                        # the current tool is drawing on the window.
211                        if not self.dragging \
212                               and time.time() - self.render_last_preview > 0.5:
213                            client_dc = wxClientDC(self)
214                            client_dc.BeginDrawing()
215                            client_dc.DrawBitmap(self.bitmap, 0, 0)
216                            client_dc.EndDrawing()
217                            self.render_last_preview = time.time()
218                    else:
219                        self.render_iter = None
220                        # Redraw if not dragging because redrawing would
221                        # interfere with what the current tool is drawing on
222                        # the window.
223                        if not self.dragging:
224                            self.redraw()
225                        finished = True
226                except StopIteration:
227                    finished = True
228                    self.render_iter = None
229                except:
230                    finished = True
231                    self.render_iter = None
232                    traceback.print_exc()
233            else:
234                self.render_iter = self._render_iterator()
235                self.render_last_preview = time.time()
236            return not finished
237    
238          # Get the window size.      def _render_iterator(self):
239          width, height = self.GetSizeTuple()          width, height = self.GetSizeTuple()
240            dc = wx.wxMemoryDC()
241    
242          # If self.bitmap's still there, reuse it. Otherwise redraw it          render_start = time.time()
243          if self.bitmap is not None:  
244              bitmap = self.bitmap          if self.bitmap is None:
245          else:              self.bitmap = wx.wxEmptyBitmap(width, height)
246              bitmap = wx.wxEmptyBitmap(width, height)              dc.SelectObject(self.bitmap)
             dc = wx.wxMemoryDC()  
             dc.SelectObject(bitmap)  
247              dc.BeginDrawing()              dc.BeginDrawing()
248    
249              # clear the background              dc.SetBackground(self.backgroundColor)
250              dc.SetBrush(wx.wxWHITE_BRUSH)              dc.Clear()
             dc.SetPen(wx.wxTRANSPARENT_PEN)  
             dc.DrawRectangle(0, 0, width, height)  
   
             if 1: #self.interactor.selected_map is self.map:  
                 selected_layer = self.interactor.selected_layer  
                 selected_shape = self.interactor.selected_shape  
             else:  
                 selected_layer = None  
                 selected_shape = None  
251    
252              # draw the map into the bitmap              # draw the map into the bitmap
253              renderer = ScreenRenderer(dc, self.scale, self.offset)              renderer = ScreenRenderer(dc, self.Map(), self.scale, self.offset,
254                                          (0, 0, width, height))
255                for cont in renderer.RenderMapIncrementally():
256                    yield True
257    
258              # Pass the entire bitmap as update_region to the renderer.              dc.EndDrawing()
259              # We're redrawing the whole bitmap, after all.              dc.SelectObject(wx.wxNullBitmap)
260              renderer.RenderMap(self.map, (0, 0, width, height),  
261                                 selected_layer, selected_shape)          if self.HasSelectedShapes() and self.selection_bitmap is None:
262                bitmap = wx.wxEmptyBitmap(width, height)
263                dc.SelectObject(bitmap)
264                dc.BeginDrawing()
265                dc.SetBackground(wx.wxWHITE_BRUSH)
266                dc.Clear()
267    
268                renderer = ScreenRenderer(dc, self.Map(), self.scale, self.offset,
269                                          (0, 0, width, height))
270                layer = self.SelectedLayer()
271                shapes = self.selection.SelectedShapes()
272                for cont in renderer.draw_selection_incrementally(layer, shapes):
273                    yield True
274    
275              dc.EndDrawing()              dc.EndDrawing()
276              dc.SelectObject(wx.wxNullBitmap)              dc.SelectObject(wx.wxNullBitmap)
             self.bitmap = bitmap  
277    
278          # blit the bitmap to the screen              bitmap.SetMask(wx.wxMaskColour(bitmap, wx.wxWHITE))
279          dc = wx.wxMemoryDC()              self.selection_bitmap = bitmap
280          dc.SelectObject(bitmap)  
281          clientdc = wxClientDC(self)          yield False
282          clientdc.BeginDrawing()  
283          clientdc.Blit(0, 0, width, height, dc, 0, 0)      def Export(self):
284          clientdc.EndDrawing()  
285            if hasattr(self, "export_path"):
286                export_path = self.export_path
287            else:
288                export_path="."
289            dlg = wxFileDialog(self, _("Export Map"), export_path, "",
290                               "Enhanced Metafile (*.wmf)|*.wmf",
291                               wxSAVE|wxOVERWRITE_PROMPT)
292            if dlg.ShowModal() == wxID_OK:
293                self.export_path = os.path.dirname(dlg.GetPath())
294                dc = wxMetaFileDC(dlg.GetPath())
295        
296                scale, offset, mapregion = output_transform(self.scale,
297                                                            self.offset,
298                                                            self.GetSizeTuple(),
299                                                            dc.GetSizeTuple())
300    
301                selected_layer = self.selection.SelectedLayer()
302                selected_shapes = self.selection.SelectedShapes()
303    
304                width, height = self.GetSizeTuple()
305                renderer = ExportRenderer(dc, self.Map(), scale, offset,
306                                          region = (0, 0,
307                                                    (width/self.scale)*scale,
308                                                    (height/self.scale)*scale),
309                                          destination_region = mapregion)
310                renderer.RenderMap(selected_layer, selected_shapes)
311    
312                dc.EndDrawing()
313                dc.Close()
314            dlg.Destroy()
315            
316      def Print(self):      def Print(self):
317          printer = wx.wxPrinter()          printer = wx.wxPrinter()
318          printout = MapPrintout(self.map)          width, height = self.GetSizeTuple()
319          printer.Print(self, printout, wx.true)          selected_layer = self.selection.SelectedLayer()
320          printout.Destroy()          selected_shapes = self.selection.SelectedShapes()
321                    
322      def SetMap(self, map):          printout = MapPrintout(self, self.Map(), (0, 0, width, height),
323          redraw_channels = (LAYERS_CHANGED, LAYER_LEGEND_CHANGED,                                 selected_layer, selected_shapes)
324                             LAYER_VISIBILITY_CHANGED)          printer.Print(self, printout, True)
325          if self.map is not None:          printout.Destroy()
             for channel in redraw_channels:  
                 self.map.Unsubscribe(channel, self.full_redraw)  
             self.map.Unsubscribe(MAP_PROJECTION_CHANGED,  
                                  self.projection_changed)  
         self.map = map  
         if self.map is not None:  
             for channel in redraw_channels:  
                 self.map.Subscribe(channel, self.full_redraw)  
             self.map.Subscribe(MAP_PROJECTION_CHANGED, self.projection_changed)  
         self.FitMapToWindow()  
         # force a redraw. If map is not empty, it's already been called  
         # by FitMapToWindow but if map is empty it hasn't been called  
         # yet so we have to explicitly call it.  
         self.full_redraw()  
   
     def Map(self):  
         return self.map  
326    
327      def redraw(self, *args):      def redraw(self, *args):
328          self.Refresh(0)          self.Refresh(False)
329    
330      def full_redraw(self, *args):      def full_redraw(self, *args):
331          self.bitmap = None          self.bitmap = None
332            self.selection_bitmap = None
333            self.render_iter = None
334          self.redraw()          self.redraw()
335    
336      def projection_changed(self, *args):      def redraw_selection(self, *args):
337          self.FitMapToWindow()          self.selection_bitmap = None
338          self.full_redraw()          self.render_iter = None
339            self.redraw()
340    
341      def set_view_transform(self, scale, offset):      def map_projection_changed(self, map, old_proj):
342          self.scale = scale          ViewPort.map_projection_changed(self, map, old_proj)
         self.offset = offset  
343          self.full_redraw()          self.full_redraw()
344    
345      def proj_to_win(self, x, y):      def layer_projection_changed(self, *args):
346          """\          ViewPort.layer_projection_changed(self, args)
347          Return the point in  window coords given by projected coordinates x y          self.full_redraw()
         """  
         offx, offy = self.offset  
         return (self.scale * x + offx, -self.scale * y + offy)  
   
     def win_to_proj(self, x, y):  
         """\  
         Return the point in projected coordinates given by window coords x y  
         """  
         offx, offy = self.offset  
         return ((x - offx) / self.scale, (offy - y) / self.scale)  
   
     def FitRectToWindow(self, rect):  
         width, height = self.GetSizeTuple()  
         llx, lly, urx, ury = rect  
         if llx == urx or lly == ury:  
             # zero with or zero height. Do Nothing  
             return  
         scalex = width / (urx - llx)  
         scaley = height / (ury - lly)  
         scale = min(scalex, scaley)  
         offx = 0.5 * (width - (urx + llx) * scale)  
         offy = 0.5 * (height + (ury + lly) * scale)  
         self.set_view_transform(scale, (offx, offy))  
   
     def FitMapToWindow(self):  
         """\  
         Set the scale and offset so that the map is centered in the  
         window  
         """  
         bbox = self.map.ProjectedBoundingBox()  
         if bbox is not None:  
             self.FitRectToWindow(bbox)  
   
     def ZoomFactor(self, factor, center = None):  
         """Multiply the zoom by factor and center on center.  
   
         The optional parameter center is a point in window coordinates  
         that should be centered. If it is omitted, it defaults to the  
         center of the window  
         """  
         width, height = self.GetSizeTuple()  
         scale = self.scale * factor  
         offx, offy = self.offset  
         if center is not None:  
             cx, cy = center  
         else:  
             cx = width / 2  
             cy = height / 2  
         offset = (factor * (offx - cx) + width / 2,  
                   factor * (offy - cy) + height / 2)  
         self.set_view_transform(scale, offset)  
   
     def ZoomOutToRect(self, rect):  
         # rect is given in window coordinates  
   
         # determine the bbox of the displayed region in projected  
         # coordinates  
         width, height = self.GetSizeTuple()  
         llx, lly = self.win_to_proj(0, height - 1)  
         urx, ury = self.win_to_proj(width - 1, 0)  
   
         sx, sy, ex, ey = rect  
         scalex = (ex - sx) / (urx - llx)  
         scaley = (ey - sy) / (ury - lly)  
         scale = min(scalex, scaley)  
   
         offx = 0.5 * ((ex + sx) - (urx + llx) * scale)  
         offy = 0.5 * ((ey + sy) + (ury + lly) * scale)  
         self.set_view_transform(scale, (offx, offy))  
   
     def Translate(self, dx, dy):  
         offx, offy = self.offset  
         self.set_view_transform(self.scale, (offx + dx, offy + dy))  
   
     def ZoomInTool(self):  
         self.tool = ZoomInTool(self)  
   
     def ZoomOutTool(self):  
         self.tool = ZoomOutTool(self)  
   
     def PanTool(self):  
         self.tool = PanTool(self)  
   
     def IdentifyTool(self):  
         self.tool = IdentifyTool(self)  
   
     def LabelTool(self):  
         self.tool = LabelTool(self)  
   
     def CurrentTool(self):  
         return self.tool and self.tool.Name() or None  
   
     def CurrentPosition(self):  
         """Return current position of the mouse in projected coordinates.  
348    
349          The result is a 2-tuple of floats with the coordinates. If the      def set_view_transform(self, scale, offset):
350          mouse is not in the window, the result is None.          ViewPort.set_view_transform(self, scale, offset)
351          """          self.full_redraw()
         if self.current_position is not None:  
             x, y = self.current_position  
             return self.win_to_proj(x, y)  
         else:  
             return None  
352    
353      def set_current_position(self, event):      def GetPortSizeTuple(self):
354          """Set the current position from event          return self.GetSizeTuple()
   
         Should be called by all events that contain mouse positions  
         especially EVT_MOTION. The event paramete may be None to  
         indicate the the pointer left the window.  
         """  
         if event is not None:  
             self.current_position = (event.m_x, event.m_y)  
         else:  
             self.current_position = None  
         self.issue(VIEW_POSITION)  
355    
356      def OnLeftDown(self, event):      def OnLeftDown(self, event):
357          self.set_current_position(event)          self.MouseLeftDown(event)
358          if self.tool is not None:          if self.tool is not None:
359              self.drag_dc = wxClientDC(self)              self.drag_dc = wxClientDC(self)
360              self.drag_dc.SetLogicalFunction(wxINVERT)              self.drag_dc.SetLogicalFunction(wxINVERT)
361              self.drag_dc.SetBrush(wxTRANSPARENT_BRUSH)              self.drag_dc.SetBrush(wxTRANSPARENT_BRUSH)
             self.CaptureMouse()  
             self.tool.MouseDown(event)  
362              self.tool.Show(self.drag_dc)              self.tool.Show(self.drag_dc)
363                self.CaptureMouse()
364              self.dragging = 1              self.dragging = 1
365            
366      def OnLeftUp(self, event):      def OnLeftUp(self, event):
367          self.ReleaseMouse()          """Handle EVT_LEFT_UP
368          self.set_current_position(event)  
369            Release the mouse if it was captured, if a tool is active call
370            its Hide method and call self.MouseLeftUp.
371            """
372            # It's important that ReleaseMouse is called before MouseLeftUp.
373            # MouseLeftUp may pop up modal dialogs which leads to an
374            # effectively frozen X session because the user can only
375            # interact with the dialog but the mouse is still grabbed by the
376            # canvas.
377          if self.dragging:          if self.dragging:
378              self.tool.Hide(self.drag_dc)              if self.HasCapture():
379              self.tool.MouseUp(event)                  self.ReleaseMouse()
380              self.drag_dc = None              try:
381          self.dragging = 0                  self.tool.Hide(self.drag_dc)
382                finally:
383                    self.drag_dc = None
384                    self.dragging = 0
385            self.MouseLeftUp(event)
386    
387      def OnMotion(self, event):      def OnMotion(self, event):
         self.set_current_position(event)  
388          if self.dragging:          if self.dragging:
389              self.tool.Hide(self.drag_dc)              self.tool.Hide(self.drag_dc)
390              self.tool.MouseMove(event)  
391            self.MouseMove(event)
392    
393            if self.dragging:
394              self.tool.Show(self.drag_dc)              self.tool.Show(self.drag_dc)
395    
396      def OnLeaveWindow(self, event):      def OnLeaveWindow(self, event):
397          self.set_current_position(None)          self.set_current_position(None)
398    
     def OnIdle(self, event):  
         if self.redraw_on_idle:  
             self.do_redraw()  
         self.redraw_on_idle = 0  
   
399      def OnSize(self, event):      def OnSize(self, event):
400          # the window's size has changed. We have to get a new bitmap. If          # the window's size has changed. We have to get a new bitmap. If
401          # we want to be clever we could try to get by without throwing          # we want to be clever we could try to get by without throwing
# Line 582  class MapCanvas(wxWindow, Publisher): Line 406  class MapCanvas(wxWindow, Publisher):
406          self.full_redraw()          self.full_redraw()
407    
408      def shape_selected(self, layer, shape):      def shape_selected(self, layer, shape):
409          self.full_redraw()          """Receiver for the SHAPES_SELECTED messages. Redraw the map."""
410            # The selection object takes care that it only issues
411      def unprojected_rect_around_point(self, x, y):          # SHAPES_SELECTED messages when the set of selected shapes has
412          """return a rect a few pixels around (x, y) in unprojected corrdinates          # actually changed, so we can do a full redraw of the
413            # selection_bitmap unconditionally.
414          The return value is a tuple (minx, miny, maxx, maxy) suitable a          ViewPort.shape_selected(self, layer, shape)
415          parameter to a layer's ShapesInRegion method.          self.redraw_selection()
416    
417        def GetTextExtent(self, text):
418            dc = wxClientDC(self)
419            font = wxFont(10, wx.wxSWISS, wx.wxNORMAL, wx.wxNORMAL)
420            dc.SetFont(font)
421            return dc.GetTextExtent(text)
422    
423        def LabelShapeAt(self, x, y, text=None):
424            """Add or remove a label at window position x, y.
425    
426            If there's a label at the given position, remove it. Otherwise
427            determine the shape at the position, run the label dialog and
428            unless the user cancels the dialog, add a label.
429          """          """
         map_proj = self.map.projection  
         if map_proj is not None:  
             inverse = map_proj.Inverse  
         else:  
             inverse = None  
   
         xs = []  
         ys = []  
         for dx, dy in ((-1, -1), (1, -1), (1, 1), (-1, 1)):  
             px, py = self.win_to_proj(x + dx, y + dy)  
             if inverse:  
                 px, py = inverse(px, py)  
             xs.append(px)  
             ys.append(py)  
         return (min(xs), min(ys), max(xs), max(ys))  
   
     def find_shape_at(self, px, py, select_labels = 0, selected_layer = 1):  
         """Determine the shape at point px, py in window coords  
   
         Return the shape and the corresponding layer as a tuple (layer,  
         shape).  
   
         If the optional parameter select_labels is true (default false)  
         search through the labels. If a label is found return it's index  
         as the shape and None as the layer.  
   
         If the optional parameter selected_layer is true (default), only  
         search in the currently selected layer.  
         """  
         map_proj = self.map.projection  
         if map_proj is not None:  
             forward = map_proj.Forward  
         else:  
             forward = None  
   
         scale = self.scale  
         offx, offy = self.offset  
   
         box = self.unprojected_rect_around_point(px, py)  
   
         if select_labels:  
             labels = self.map.LabelLayer().Labels()  
               
             if labels:  
                 dc = wxClientDC(self)  
                 font = wxFont(10, wx.wxSWISS, wx.wxNORMAL, wx.wxNORMAL)  
                 dc.SetFont(font)  
                 for i in range(len(labels) - 1, -1, -1):  
                     label = labels[i]  
                     x = label.x  
                     y = label.y  
                     text = label.text  
                     if forward:  
                         x, y = forward(x, y)  
                     x = x * scale + offx  
                     y = -y * scale + offy  
                     width, height = dc.GetTextExtent(text)  
                     if label.halign == ALIGN_LEFT:  
                         # nothing to be done  
                         pass  
                     elif label.halign == ALIGN_RIGHT:  
                         x = x - width  
                     elif label.halign == ALIGN_CENTER:  
                         x = x - width/2  
                     if label.valign == ALIGN_TOP:  
                         # nothing to be done  
                         pass  
                     elif label.valign == ALIGN_BOTTOM:  
                         y = y - height  
                     elif label.valign == ALIGN_CENTER:  
                         y = y - height/2  
                     if x <= px < x + width and y <= py <= y + height:  
                         return None, i  
   
         if selected_layer:  
             layer = self.interactor.SelectedLayer()  
             if layer is not None:  
                 layers = [layer]  
             else:  
                 # no layer selected. Use an empty list to effectively  
                 # ignore all layers.  
                 layers = []  
         else:  
             layers = self.map.Layers()  
   
         for layer_index in range(len(layers) - 1, -1, -1):  
             layer = layers[layer_index]  
   
             # search only in visible layers  
             if not layer.Visible():  
                 continue  
   
             filled = layer.fill is not None  
             stroked = layer.stroke is not None  
                   
             layer_proj = layer.projection  
             if layer_proj is not None:  
                 inverse = layer_proj.Inverse  
             else:  
                 inverse = None  
                   
             shapetype = layer.ShapeType()  
   
             select_shape = -1  
   
             shape_ids = layer.ShapesInRegion(box)  
             shape_ids.reverse()  
   
             if shapetype == SHAPETYPE_POLYGON:  
                 for i in shape_ids:  
                     result = point_in_polygon_shape(layer.shapefile.cobject(),  
                                                     i,  
                                                     filled, stroked,  
                                                     map_proj, layer_proj,  
                                                     scale, -scale, offx, offy,  
                                                     px, py)  
                     if result:  
                         select_shape = i  
                         break  
             elif shapetype == SHAPETYPE_ARC:  
                 for i in shape_ids:  
                     result = point_in_polygon_shape(layer.shapefile.cobject(),  
                                                     i, 0, 1,  
                                                     map_proj, layer_proj,  
                                                     scale, -scale, offx, offy,  
                                                     px, py)  
                     if result < 0:  
                         select_shape = i  
                         break  
             elif shapetype == SHAPETYPE_POINT:  
                 for i in shape_ids:  
                     shape = layer.Shape(i)  
                     x, y = shape.Points()[0]  
                     if inverse:  
                         x, y = inverse(x, y)  
                     if forward:  
                         x, y = forward(x, y)  
                     x = x * scale + offx  
                     y = -y * scale + offy  
                     if hypot(px - x, py - y) < 5:  
                         select_shape = i  
                         break  
   
             if select_shape >= 0:  
                 return layer, select_shape  
         return None, None  
   
     def SelectShapeAt(self, x, y):  
         layer, shape = self.find_shape_at(x, y, selected_layer = 0)  
         # If layer is None, then shape will also be None. We don't want  
         # to deselect the currently selected layer, so we simply select  
         # the already selected layer again.  
         if layer is None:  
             layer = self.interactor.SelectedLayer()  
         self.interactor.SelectLayerAndShape(layer, shape)  
   
     def LabelShapeAt(self, x, y):  
         ox = x; oy = y  
430          label_layer = self.map.LabelLayer()          label_layer = self.map.LabelLayer()
431          layer, shape_index = self.find_shape_at(x, y, select_labels = 1)          layer, shape_index = self.find_shape_at(x, y, select_labels = 1)
432          if layer is None and shape_index is not None:          if layer is None and shape_index is not None:
433              # a label was selected              ViewPort.LabelShapeAt(self, x, y)
             label_layer.RemoveLabel(shape_index)  
434          elif layer is not None:          elif layer is not None:
435              text = labeldialog.run_label_dialog(self, layer.table, shape_index)              text = labeldialog.run_label_dialog(self,
436              if text:                                                  layer.ShapeStore().Table(),
437                  proj = self.map.projection                                                  shape_index)
438                  if proj is not None:              ViewPort.LabelShapeAt(self, x, y, text)
                     map_proj = proj  
                 else:  
                     map_proj = None  
                 proj = layer.projection  
                 if proj is not None:  
                     layer_proj = proj  
                 else:  
                     layer_proj = None  
   
                 shapetype = layer.ShapeType()  
                 if shapetype == SHAPETYPE_POLYGON:  
                     x, y = shape_centroid(layer.shapefile.cobject(),  
                                           shape_index,  
                                           map_proj, layer_proj, 1, 1, 0, 0)  
                     if map_proj is not None:  
                         x, y = map_proj.Inverse(x, y)  
                 else:  
                     shape = layer.Shape(shape_index)  
                     if shapetype == SHAPETYPE_POINT:  
                         x, y = shape.Points()[0]  
                     else:  
                         # assume SHAPETYPE_ARC  
                         points = shape.Points()  
                         x, y = points[len(points) / 2]  
                     if layer_proj is not None:  
                         x, y = layer_proj.Inverse(x, y)  
                 if shapetype == SHAPETYPE_POINT:  
                     halign = ALIGN_LEFT  
                     valign = ALIGN_CENTER  
                 elif shapetype == SHAPETYPE_POLYGON:  
                     halign = ALIGN_CENTER  
                     valign = ALIGN_CENTER  
                 elif shapetype == SHAPETYPE_ARC:  
                     halign = ALIGN_LEFT  
                     valign = ALIGN_CENTER  
                 label_layer.AddLabel(x, y, text,  
                                      halign = halign, valign = valign)  
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